The helical feed pattern was created by the way the v2 hobbed bolt was made
(from a THREADED rod - therefor the twisting). The new bolt is CNC machines
as far as I know and has a strictly symmetrical and sharp pattern.
I will keep you posted, if I manage to do another round of comparison, but
from what I've already seen: 100% must have item.
For example: I've never seen a dirty v3 bolt so far. They just don't get
dirty, because I've rarely seen one failing (eating the filament), due to
better performance. And even if you're having something stuck in it:
Disassemble the whole thing with just one step (unclipping the delrin part)
and knock it several times against a table. That's it. There's no hobbed
area where it could stick to. Just sharp teeth :)